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Defrost Cycle and VisionPRO Thermostat

With a head pump defrosts and is controlled by a VisionPRO thermostat (TH8320U1008 in this scenario), should the thermostat display "Aux Heat On?" Mine does not, but the air coming out of the registers isn't really cold, it's more in the 70 degrees range. I don't even think it makes a click, but perhaps the W wire goes right from the ODU to the AHU; I don't know. I had a service tech check over the wiring for the thermostat. Does this sound normal? Thanks!